Fix launch when no java is loaded

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/launch/TaskStepWrapper.h

@@ -0,0 +1,41 @@
+/* Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <LoggedProcess.h>
+#include <QObjectPtr.h>
+#include <java/JavaChecker.h>
+#include <launch/LaunchStep.h>
+#include <net/Mode.h>
+
+class TaskStepWrapper : public LaunchStep {
+    Q_OBJECT
+   public:
+    explicit TaskStepWrapper(LaunchTask* parent, Task::Ptr task) : LaunchStep(parent), m_task(task) {};
+    virtual ~TaskStepWrapper() = default;
+
+    void executeTask() override;
+    bool canAbort() const override;
+    void proceed() override;
+   public slots:
+    bool abort() override;
+
+   private slots:
+    void updateFinished();
+
+   private:
+    Task::Ptr m_task;
+};